Novel hydrolysis kettle double-explosion-proof device

Abstract

The utility model relates to the technical field of chemical production safety, in particular to a novel hydrolysis kettle double-explosion-proof device which can prevent furfural produced in a pot from resinifying and sticking an emptying valve due to the fact that the emptying valve does not act for a long time, so that the safety is improved. Comprising a hydrolysis mechanism; the furfural hydrolysis device further comprises a pressure detection mechanism and a pressure relief mechanism, the pressure detection mechanism is installed on the hydrolysis mechanism, the pressure relief mechanism is installed on the hydrolysis mechanism, furfural is hydrolyzed through the hydrolysis mechanism, the pressure detection mechanism detects the pressure in the hydrolysis mechanism, and the pressure relief mechanism relieves the pressure in the hydrolysis mechanism.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical production safety, and in particular to a novel double explosion-proof device for hydrolysis reactors. Background Technology

[0002] Furfural, also known as furanaldehyde, is a widely used organic chemical raw material. It can be used as a solvent and is also an important raw material for organic synthesis. More than 1,600 chemical products can be synthesized directly or indirectly from furfural. The main uses of furfural are as a raw material for furfuryl alcohol, lubricating oil refining solvent, furan resin, tetrahydrofuran, furfural resin, furfural ketone resin, etc. In addition, it can also be used to synthesize auxiliaries. It is widely used in food, fragrance, dye, pharmaceutical, pesticide, resin, daily chemical, casting, textile and petroleum industries. The hydrolysis method of furfural is as follows: After screening and crushing corn cobs and dilute sulfuric acid are thoroughly mixed in a certain proportion, they are put into a hydrolysis pot; steam is introduced from the bottom of the hydrolysis pot for hydrolysis, and a certain pressure and temperature are controlled. However, due to uneven acid concentration and excessively fast reaction rate, the pressure in the hydrolysis pot becomes too high, exceeding the pressure resistance limit of the hydrolysis pot, causing it to rupture. In more serious cases, it may even explode, resulting in a safety accident. In the normal production process, a vent is left on the lid of the hydrolysis pot. When the pressure inside the pot is too high, the vent is opened to release the gas inside the pot and reduce the pressure.

[0003] Existing hydrolysis reactors, such as the prior art with application number CN201520620814.5, include a reactor body, upper head, lower head, automatic steam temperature control valve, automatic feed control valve, automatic discharge valve, automatic venting valve, pressure sensor, liquid level sensor, temperature sensor, feed port, and discharge port. By optimizing the structure of the hydrolysis reactor, the traditional carbon steel or enamel material of the hydrolysis reactor is replaced with a double-layer sidewall structure consisting of an inner sidewall and an outer sidewall. The inner sidewall is made of 316L stainless steel plate, and the outer sidewall is made of carbon steel plate. This achieves both corrosion resistance and wear resistance in the hydrolysis reactor, greatly improving the safety and stability of production operation.

[0004] However, often the vent valve at the vent outlet is clogged because it has not been used for a long time, and the furfural resin produced inside the pot has become fused with it. When the pressure is too high, the vent valve cannot be opened, and eventually the excessive pressure damages the hydrolysis pot. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a novel double explosion-proof device for hydrolysis reactors to prevent furfural resin from forming inside the reactor and clogging the vent valve due to prolonged inactivity, thereby improving safety.

[0006] This utility model discloses a novel double explosion-proof device for a hydrolysis reactor, comprising a hydrolysis mechanism, a pressure detection mechanism, and a pressure relief mechanism. The pressure detection mechanism and the pressure relief mechanism are installed on the hydrolysis mechanism. The hydrolysis mechanism hydrolyzes furfural, the pressure detection mechanism detects the pressure within the hydrolysis mechanism, and the pressure relief mechanism releases the pressure within the hydrolysis mechanism. This prevents explosions caused by untimely pressure relief, improves safety, protects the hydrolysis reactor from damage, and enhances practicality.

[0007] Preferably, the hydrolysis mechanism includes a hydrolysis reactor, a feed hopper, a steam pipe, a slag discharge pipe, and a slag discharge valve. The feed hopper is installed at the top of the hydrolysis reactor, the steam pipe is installed on the side wall at the bottom of the hydrolysis reactor and has a steam inlet, the slag discharge pipe is installed at the bottom of the hydrolysis reactor, and the slag discharge valve is installed on the slag discharge pipe. The screened and crushed corn cobs and dilute sulfuric acid are fully mixed in a certain proportion through the feed hopper and added to the hydrolysis reactor. Steam is introduced into the hydrolysis reactor through the steam pipe, and then the waste residue is discharged through the slag discharge pipe by opening the slag discharge valve.

[0008] Preferably, the pressure detection mechanism includes an aldehyde vapor pipeline, a first pressure remote transmission device, and a second pressure remote transmission mechanism. The aldehyde vapor pipeline is installed at the top of the hydrolysis vessel and is equipped with an aldehyde vapor drain plug. The first pressure remote transmission device is installed on the aldehyde vapor pipeline, and the second pressure remote transmission mechanism is installed on the steam pipe near the steam inlet. The pressure inside the hydrolysis vessel is monitored in real time through the first pressure remote transmission device and the second pressure remote transmission mechanism. Under normal circumstances, the pressure relief mechanism at the bottom of the hydrolysis vessel is controlled by the second pressure remote transmission mechanism. The first pressure remote transmission device on the aldehyde vapor pipeline often cannot accurately display the pressure because it is clogged with the fine corn cob hairs inside the hydrolysis vessel.

[0009] Preferably, the pressure relief mechanism includes a first pressure relief device, a bypass pipeline, and a safety switch valve. The top cover of the hydrolysis reactor is equipped with a vent, and the first pressure relief device is installed on the vent. A bypass pipeline is installed on the slag discharge pipe, and a motor-controlled safety switch valve is installed on the bypass pipeline. The pressure inside the hydrolysis reactor is monitored in real time through a first pressure remote transmission device and a second pressure remote transmission mechanism. Under normal circumstances, the safety switch valve at the bottom of the hydrolysis reactor is regulated by the second pressure remote transmission mechanism. The first pressure remote transmission device on the aldehyde vapor pipeline often cannot accurately display the pressure due to the small corn cob fuzz inside the hydrolysis reactor. When the reaction pressure of the hydrolysis reactor is 1.0 MPa, and when either the second pressure remote transmission mechanism or the first pressure remote transmission device displays 1.2 MPa, the bottom safety switch valve will be opened to relieve pressure.

[0010] Preferably, the first pressure relief device is a combination of a rupture disc and a safety valve; the rupture disc on the hydrolysis reactor's venting pipe is set to a pressure of 1.4 MPa, and the safety valve's opening pressure is set to 1.4 MPa. When either the second pressure transmission mechanism or the first pressure transmission device displays 1.4 MPa, the rupture disc and the safety valve will act sequentially. The reaction gas inside the hydrolysis reactor becomes acidic, and furfural gas is easily resinified when it encounters air. If only a rupture disc is used, the pressure inside the hydrolysis reactor may not be reached, but long-term acid corrosion will still cause the rupture disc to rupture. If only a safety valve is used, the resinification will clog the safety valve, preventing it from opening in time.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: the hydrolysis mechanism hydrolyzes furfural, the pressure detection mechanism detects the pressure inside the hydrolysis mechanism, and the pressure relief mechanism relieves the pressure inside the hydrolysis mechanism, preventing explosion caused by untimely pressure relief, improving safety, protecting the hydrolysis kettle from damage, and improving practicality. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is the utility model Figure 1 A schematic diagram of the enlarged upper structure;

[0014] Figure 3 This is the utility model Figure 1 A schematic diagram of the enlarged lower part of the structure;

[0015] The attached diagram is labeled as follows: 01, hydrolysis mechanism; 11, hydrolysis kettle; 12, feed hopper; 13, steam pipe; 14, steam inlet; 15, slag discharge pipe; 16, slag discharge valve; 02, pressure detection mechanism; 21, aldehyde vapor pipeline; 22, aldehyde vapor drain valve; 23, first pressure remote transmission device; 24, second pressure remote transmission mechanism; 03, pressure relief mechanism; 31, first pressure relief device; 32, bypass pipeline; 33, safety switch valve. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0017] Example 1

[0018] like Figures 1 to 3As shown, a novel double explosion-proof device for a hydrolysis reactor includes a hydrolysis mechanism 01, a pressure detection mechanism 02, and a pressure relief mechanism 03. The pressure detection mechanism 02 is installed on the hydrolysis mechanism 01, and the pressure relief mechanism 03 is installed on the hydrolysis mechanism 01.

[0019] Furfural is hydrolyzed by hydrolysis mechanism 01, pressure detection mechanism 02 detects the pressure inside hydrolysis mechanism 01, and pressure relief mechanism 03 relieves the pressure inside hydrolysis mechanism 01.

[0020] The hydrolysis mechanism 01 includes a hydrolysis vessel 11, a feed hopper 12, a steam pipe 13, a slag discharge pipe 15, and a slag discharge valve 16. The feed hopper 12 is installed at the top of the hydrolysis vessel 11, the steam pipe 13 is installed on the side wall at the bottom of the hydrolysis vessel 11, and a steam inlet 14 is provided on the steam pipe 13. The slag discharge pipe 15 is installed at the bottom of the hydrolysis vessel 11, and the slag discharge valve 16 is installed on the slag discharge pipe 15.

[0021] The pressure detection mechanism 02 includes an aldehyde vapor pipeline 21, a first pressure remote transmission device 23, and a second pressure remote transmission mechanism 24. The aldehyde vapor pipeline 21 is installed at the top of the hydrolysis kettle 11, and an aldehyde vapor drain buckle 22 is provided on the aldehyde vapor pipeline 21. The first pressure remote transmission device 23 is installed on the aldehyde vapor pipeline 21, and the second pressure remote transmission mechanism 24 is installed on the steam pipe 13. The second pressure remote transmission mechanism 24 is located near the steam inlet 14.

[0022] The pressure relief mechanism 03 includes a first pressure relief device 31, a bypass pipeline 32 and a safety switch valve 33. The upper lid of the hydrolysis kettle 11 is provided with a vent, and the first pressure relief device 31 is installed on the vent. The bypass pipeline 32 is installed on the slag discharge pipe 15, and the safety switch valve 33 is controlled by a motor on the bypass pipeline 32.

[0023] After being thoroughly mixed with pulverized corn cobs and dilute sulfuric acid in a certain proportion through the feed hopper 12, the mixture is added to the hydrolysis reactor 11. Steam is introduced into the hydrolysis reactor 11 through the steam pipe 13. Then, the waste residue is discharged through the slag discharge pipe 15 by opening the slag discharge valve 16. The pressure inside the hydrolysis reactor 11 is monitored in real time through the first pressure remote transmission device 23 and the second pressure remote transmission mechanism 24. Under normal circumstances, the pressure relief mechanism 03 at the bottom of the hydrolysis reactor 11 is regulated by the second pressure remote transmission mechanism 24. The first pressure remote transmission device 23 on the aldehyde vapor pipeline 21 often cannot accurately display the pressure due to the fine corn cob hairs inside the hydrolysis reactor 11. The pressure is monitored in real time by the first pressure remote transmission device 23 and the second pressure remote transmission mechanism 24. Under normal circumstances, the second pressure remote transmission mechanism 24 controls the safety switch valve 33 at the bottom of the hydrolysis vessel 11. The first pressure remote transmission device 23 on the aldehyde vapor pipeline 21 often cannot accurately display the pressure due to the small corn cob hairs inside the hydrolysis vessel 11 being clogged. When the reaction pressure of the hydrolysis vessel 11 is 1.0 MPa, and when either the second pressure remote transmission mechanism 24 or the first pressure remote transmission device 23 displays 1.2 MPa, the bottom safety switch valve 33 will be opened to release the pressure.

[0024] Example 2

[0025] like Figures 1 to 3 As shown, a novel double explosion-proof device for a hydrolysis reactor includes a hydrolysis mechanism 01, a pressure detection mechanism 02, and a pressure relief mechanism 03. The pressure detection mechanism 02 is installed on the hydrolysis mechanism 01, and the pressure relief mechanism 03 is installed on the hydrolysis mechanism 01.

[0026] Furfural is hydrolyzed by hydrolysis mechanism 01, pressure detection mechanism 02 detects the pressure inside hydrolysis mechanism 01, and pressure relief mechanism 03 relieves the pressure inside hydrolysis mechanism 01.

[0027] The hydrolysis mechanism 01 includes a hydrolysis vessel 11, a feed hopper 12, a steam pipe 13, a slag discharge pipe 15, and a slag discharge valve 16. The feed hopper 12 is installed at the top of the hydrolysis vessel 11, the steam pipe 13 is installed on the side wall at the bottom of the hydrolysis vessel 11, and a steam inlet 14 is provided on the steam pipe 13. The slag discharge pipe 15 is installed at the bottom of the hydrolysis vessel 11, and the slag discharge valve 16 is installed on the slag discharge pipe 15.

[0028] The pressure detection mechanism 02 includes an aldehyde vapor pipeline 21, a first pressure remote transmission device 23, and a second pressure remote transmission mechanism 24. The aldehyde vapor pipeline 21 is installed at the top of the hydrolysis kettle 11, and an aldehyde vapor drain buckle 22 is provided on the aldehyde vapor pipeline 21. The first pressure remote transmission device 23 is installed on the aldehyde vapor pipeline 21, and the second pressure remote transmission mechanism 24 is installed on the steam pipe 13. The second pressure remote transmission mechanism 24 is located near the steam inlet 14.

[0029] The pressure relief mechanism 03 includes a first pressure relief device 31, a bypass pipeline 32 and a safety switch valve 33. The upper lid of the hydrolysis kettle 11 is provided with a vent, and the first pressure relief device 31 is installed on the vent. The bypass pipeline 32 is installed on the slag discharge pipe 15, and the safety switch valve 33 is controlled by a motor on the bypass pipeline 32.

[0030] The first pressure relief device 31 is a combination of a rupture disc and a safety valve;

[0031] The rupture disc on the vent pipe of the hydrolysis reactor 11 is set to a pressure of 1.4 MPa, and the safety valve opening pressure is also set to 1.4 MPa. When either the second pressure transmission mechanism 24 or the first pressure transmission device 23 displays 1.4 MPa, the rupture disc and the safety valve will activate sequentially. The reaction gas inside the hydrolysis reactor becomes acidic, and furfural gas is highly susceptible to resinification when it comes into contact with air. If only the rupture disc is used, the pressure inside the hydrolysis reactor 11 may not be reached, but long-term acid corrosion will still cause the rupture disc to rupture. If only the safety valve is used, the resinification will clog the safety valve, preventing it from opening in time.

[0032] like Figures 1 to 3As shown, this utility model discloses a novel double explosion-proof device for a hydrolysis reactor. During operation, pulverized corn cobs and dilute sulfuric acid are thoroughly mixed in a certain proportion and added to the hydrolysis reactor 11 via the feed hopper 12. Steam is introduced into the hydrolysis reactor 11 through the steam pipe 13. Then, waste residue is discharged through the slag discharge pipe 15 by opening the slag discharge valve 16. The pressure inside the hydrolysis reactor 11 is monitored in real time by a first pressure remote transmission device 23 and a second pressure remote transmission mechanism 24. Normally, the second pressure remote transmission mechanism 24 controls the pressure relief mechanism 03 at the bottom of the hydrolysis reactor 11. The first pressure remote transmission device 23 on the aldehyde vapor pipeline 21 often fails to accurately display the pressure due to the fine corn cob fibers inside the hydrolysis reactor 11 clogging the system. Therefore, the first pressure remote transmission device 23 and the second pressure remote transmission mechanism 24 monitor the pressure inside the hydrolysis reactor 11 in real time. Normally, the second pressure remote transmission mechanism 24 controls the safety switch valve 33 at the bottom of the hydrolysis reactor 11. The first pressure remote transmission device 23 often fails to accurately display the pressure due to the fine corn cob hairs inside the hydrolysis vessel 11 clogging it. When the reaction pressure in the hydrolysis vessel 11 is 1.0 MPa, if either the second pressure remote transmission mechanism 24 or the first pressure remote transmission device 23 displays 1.2 MPa, the bottom safety switch valve 33 will open to release pressure. The rupture disc on the vent pipe of the hydrolysis vessel 11 is set to a pressure of 1.4 MPa, and the safety valve opening pressure is set to 1.4 MPa. When either the second pressure remote transmission mechanism 24 or the first pressure remote transmission device 23 displays 1.4 MPa, the rupture disc and the safety valve will act sequentially. The reaction gas inside the hydrolysis vessel becomes acidic, and furfural gas is easily resinified when it encounters air. If only the rupture disc is used, the pressure inside the hydrolysis vessel 11 may not be reached, but long-term acid corrosion will also cause the rupture disc to rupture. If only the safety valve is used, the resinification will clog the safety valve, preventing it from opening in time.

[0033] The first pressure remote transmission device 23 and the second pressure remote transmission mechanism 24 of this utility model are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0034] The main function of this utility model is to prevent the vent valve from being blocked by furfural resin produced inside the boiler due to prolonged inactivity during chemical production, thereby improving safety.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A new type of hydrolysis kettle double explosion-proof device, comprising a hydrolysis mechanism (01); characterized in that, Also include pressure detection mechanism (02) and pressure relief mechanism (03), pressure detection mechanism (02) is installed on the hydrolysis mechanism (01), pressure relief mechanism (03) is installed on the hydrolysis mechanism (01); The hydrolysis mechanism (01) hydrolyzes furfural, the pressure detection mechanism (02) detects the pressure in the hydrolysis mechanism (01), and the pressure relief mechanism (03) relieves the pressure in the hydrolysis mechanism (01); The hydrolysis mechanism (01) includes a hydrolysis kettle (11), a feed hopper (12), a steam pipe (13), a slag discharge pipe (15) and a slag discharge valve (16), the feed hopper (12) is installed at the top end of the hydrolysis kettle (11), the steam pipe (13) is installed on the side wall of the bottom of the hydrolysis kettle (11), the steam pipe (13) is provided with a steam inlet (14), the slag discharge pipe (15) is installed at the bottom end of the hydrolysis kettle (11), and the slag discharge valve (16) is installed on the slag discharge pipe (15); The pressure detection mechanism (02) includes an aldehyde vapor pipeline (21), a first pressure remote transmission device (23) and a second pressure remote transmission mechanism (24), the aldehyde vapor pipeline (21) is installed at the top end of the hydrolysis kettle (11), the aldehyde vapor pipeline (21) is provided with an aldehyde vapor discharge buckle (22), the first pressure remote transmission device (23) is installed on the aldehyde vapor pipeline (21), and the second pressure remote transmission mechanism (24) is installed on the steam pipe (13), and the second pressure remote transmission mechanism (24) is located near the steam inlet (14).

2. A new type of hydrolysis kettle double explosion-proof device according to claim 1, characterized in that, The pressure relief mechanism (03) includes a first pressure relief device (31), a bypass pipeline (32) and a safety switch valve (33), the hydrolysis kettle (11) is provided with a vent on the pot cover, the first pressure relief device (31) is installed on the vent, the bypass pipeline (32) is installed on the slag discharge pipe (15), and the safety switch valve (33) is controlled by a motor on the bypass pipeline (32).

3. The dual explosion-proof device of a new hydrolysis kettle according to claim 2, characterized in that, The first pressure relief device (31) is a combination of a bursting disc and a safety valve.

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